I've only been riding my road bike for about a month. I ride 20-25 miles daily, all on a rail trail bike path. Only about 11.5 mph average but it gets the job done. There's a century ride 6 weeks from now near me, billed as a flat-to-rolling tour with lots of support and not a race. They stop 5 times during the 100. It seems to me that if I can ride 25 in the morning and be ok to go to work afterwards without a lot of noticeable pain, I should be able to have a goal of doing 20 five times in a row with rest breaks in between and be fine. They have 10, 25, and 50 mile options, and I could bail from the 100 to the 50 midway if I wanted to. I'm 44 without any health problems I can think of other than being about 250 pounds and that's coming off nicely with the nice calorie expenditure from cycling. And thinking about the century gives me a nice, seemly unattainable goal, and that works for me. Within a couple of weeks I'll have appropriate shorts, shoes and shirts; the bike was expensive enough (Specialized Sequoia Sport, love it) that I skimped on the extras for the first month. Here's my questions. 1. Am I nuts for thinking I can do this? My first inclination is to get a physical and explain what I'm up to, and presuming there's not a big problem there, go on. 2. If it seems ok, how can I train for this? My first inclination is to do a 50 every couple of weeks on the rail trail, not early in the morning but later on in the day, 25 miles slightly uphill along a river, 25 miles back slightly downhill, and if that is comfortably achievable, go on and do the tour. Then in the days in between, work on getting up to about 14 mph, as it looks like from the brochure that they figure about that, and work on rolling hills.